0333 003 22 96
Heated vs. Unheated Propagator - Which is Best?

Heated vs. Unheated Propagator - Which is Best?

Which is better at germinating seeds - a heated or unheated propagator?

We put 'em to the test! And here's what we found out.

What we Did

We bought 6 types of herb seeds:

  • Holy basil
  • Majoram
  • Oregano
  • Parsley
  • Sage
  • Purple basil

None had been crushed or cracked in transit - all seemed viable, so we got to work.

Step 1

presoakingpresoaking

VitaLink Plant Start and Canna Rhizotonic were mixed with some dechlorinated water.

The pH was adjusted to 6.5 and two trays of Grodan Cutting Seed Cubes were pre-soaked.

Step 2

presoakingpresoaking

As cubes were removed, excess moisture was squeezed out.

This made sure the rooting environment wasn't too moist. 

Step 3

presoakingpresoaking

Seeds were gently placed in the cubes. Where possible, they were covered with loose bits of rockwool

Step 4

presoakingpresoaking

We labelled trays as we went, so we know which plants came from which seeds.

By the time we were done, we had two identical seed trays. 

Step 5

PropagatorPropagator

One went into the Hi-Top Unheated Propagator.

The other went into a Hi-Top Heated Propagator.

Step 6

PropagatorPropagator

The propagators went into the same tent, each under their own T5 light.

Vents were left closed, to keep the humidity high.

Results

We started seeing differences just 5 days in. 

Day 2

Already, small cracks were starting to form on seeds in the heated propagtor. There were still no signs of life in the unheated propagator.

Heated propagator - day 2

seedsseeds

Unheated propagator - day 2

seedsseeds

Day 5

There's been quite a bit of action in both propagators. 

Far more seeds had sprouted in the heated propagator. And they werere bigger - the purple basil especially!

It's worth noting that the heated propagator needed spraying with water at this point because the cubes had started to dry a little. This is something you need to keep an eye on if you use a heated propagator. 

Heated propagator - day 5

seedsseeds

Unheated propagator - day 5

seedsseeds

Day 7

By now, all seed varieties have sprouted in the heated propagator. They look pretty big, too.  

In the unheated propagator, the holy basil seeds are yet to germinate. 

Heated propagator - day 7

seedsseeds

Unheated propagator - day 7

seedsseeds

Day 9

By now, the seeds in the heated propagator are steaming ahead! They're much more advanced. More parsley seeds have germinanted in the unheated propagator but still no holy basil. 

Heated propagator - day 9

seedsseeds

Unheated propagator - day 9

seedsseeds

Related Products


Ian
Ian
About the author

Ian's our Sheffield shop manager. He loves tinkering in the greenhouse. Drop by to see what he's growing.

GroWell Hydroponics Sheffield

Call GroWell Sheffield:
0114 243 9242